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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3666a223b6950115c64038b44c9d116e3a668a1f86be9dd24a98857a7893e53' 
  AND token = 's12Gh0bmkosYOsKj6r9MZytgDGNd3lY2hOKRLp+Qhak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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