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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c93d38fdd2f45c8f2721c5e0faf4fc209d9f2c683bae34e5107b1ab8a28bd1' 
  AND token = 'jVb9UVUXdIKZbpd5ct5yI59WZGFyTChcmA7zzf07XyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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