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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ac641bf38a12ef7919fa6b4dfe5c56bfd3140dd9324b472bb19e2a85df78f1' 
  AND token = 'wyfdCDat8hv/xLT6PcScJYaQLB8YFr2lHE/InPhN5RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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