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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ddd090e087b0793119de3facb598bd472faeddf6c4b989b608eb0c8defb190f' 
  AND token = 'BT54HJgS6vwa6zMXjtbxyN4MwAG7FD5SGG9YK+vqfZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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