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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf589c77685afe6219feddd73a5b5ccb18c2647c6b49cb6fc6454e3ec8d02a6' 
  AND token = 'i6vAKBbagXNb4kuve3axVaIKwYCmvtbXthLPvC3e+Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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