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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8408c97c6cc062233b09f7fe7584c146d1c76ec67611a7ff2a817c1097f37713' 
  AND token = 'bZMoN/50Y1d3CW8f5yV2ofIuZz+SunYf3kDvemEYHw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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