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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b37adacb2525f86b6c410c8e5a11af22110110d086986ccbd1c27dc52e7d8c8' 
  AND token = 'd/7XMJrIgu29JuiftyWIOOxV+WdgzFIRRXP/96w3O64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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