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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fb65c566fe25d53573115ed3ee710734e730e4364e835db044da173e0139ae' 
  AND token = 'HC7FzHorCIic8XxXhsEH8e2uJn6btSa2R9oE7ypQpuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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