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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ca1433cdf9595cdd6308316efdd2b8de3452804dede8283e0461d79e1b2163' 
  AND token = '4i9vtWeOw9oxLwyZodozUPHzGfm9+iANTxE23jj1N08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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