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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c2ae14459e8a0a5568631917abb1b685b6c8b4eee925b61f28d5bc93577f6f' 
  AND token = 'xbQa/im9y5NyyopIzyO4DxM//POmVxTYI241VRV0+Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}