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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fddce23f3f9cd00d852708dd24cd6c3432a63785947a09ea4d8c8151bda3109' 
  AND token = 'NnjGZRJFdBRxOmZIfxOZg5Atvil6G9DzyIq1lNtYqyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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