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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc6d1cd66d04f508f6ad2e75b4fad079a5a5536cbf7a2d45a603db553b04e51' 
  AND token = 'q4ZZa2jAWDi6h9lvkembmnZ6ktKpkuRwBOedBaEnxpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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