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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3136d71d3f966ba11d73dba841651ac9b3f41e267aaf3ba9dd27f9c94e01646' 
  AND token = 'W8ef7kuw6JJGmd0MkW9f0mm14iZdNWE4881g16+8aXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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