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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55b3a45f2778ebefc7c656cb8890b925f959aac35c80b64ed5f1d2d7787fdcb' 
  AND token = 'nERmorACcSIE9EoFdeK3qVV7qlXrE/cWsrTSd7LN42k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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