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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc297f1c72d32a1b211fac24d535aa1bf95ed3ecf2ef20c07a29ec2a7ca3cc7' 
  AND token = 'bptRHqkb+DwVkLv3ygNlTSbCFlfBB5z6MA+LaQndskY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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