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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49672c70fef05c95d120572225fe0fc7f818c6ff666f29adbb6e114963cfd9e' 
  AND token = 'bb9hxf6Cg3tiVU7pOKZG1N7GrFz0SiegaPlZT9RG1kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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