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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5ea8bc53feb279909e6868cfd425f13ce372412c40c88d08a8182476ab8033' 
  AND token = 'Ju31624NI8V5apdTMJEdV7bfNDcKPuyYAqRONt0NLnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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