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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c88fa3f71931bb9d91399cb370193a9b8943c33fc687bfcef423c72844c2c05' 
  AND token = 'tKhk42W1Fp7pofqtXOWbXQ1ewTsxq0aY8453wo3j7mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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