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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63cda31356452f9f44f4845d935ad524f5a342a4a8f5ff67a3c092644330ed2' 
  AND token = '0xnIlCeaoycs/EFDDtpU2w/qcORHPJlYToHhdNeIrLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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