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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d36f21d15312f08ea707bba715939e9bbb40b76db9921c719bfebe5233cf537' 
  AND token = 'clL56i4D+X3iiXtKtYPPSeHsRdii/i02QJ+eWo0tb6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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