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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e942c321cfa31d11f7daeedd5dae787b7901f0fb068f9a2c5bb01d7aa455f03' 
  AND token = 'Y3SHfcJeYiYEwjbOnfvjJmlfKPoI00WWgK4cXrCFjS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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