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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17df20660c56504a6f82dcb0ed108568c16ebb51dfadd8114d3a1fc1702d8660' 
  AND token = 'ZETxi+N+wlUoyojkhechIX/VLV1z35HozKNxexOW/jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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