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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65774a03a8895238ea29aa88fbe9a628a0ff96c1c324cc7b1ade8717ceb90ba9' 
  AND token = '0rs/PXjaH2XGIRMY4Xf9Q7MhC+JN7+3btIuTpNBq4tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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