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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc417a07c4d67c04d1fbcb463aee07c03f3fb7a2c909a194226efa17c0a2973' 
  AND token = 'H9rMaVD4MR3DxNJgeUTXH2bcYlPdlpQtVOl18e2kTxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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