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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0139463bb869fa8946ac38188b75523b55d34df26eab01099586f3a557d397' 
  AND token = 'cPrt5lu/JcwQpkjOKbo5v05PjASYWauEeY94rJLONXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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