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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d3e12f4d47616c902ce3617b4b62d0618f10ece508d50d6311cc2576a61089' 
  AND token = 'Yu5z5lOjqNAhuLnmpBw+BIXYYydLFR74z233PdJ+w7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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