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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a4990637c2dfdefb97d145b0d91dad919da06c758e82efbe7d7b9bb7f7ceed' 
  AND token = 'oXfApaJ8qq4q2efzy/Rml+CCy6WyCokqAqW0I6LobnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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