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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca5a59561a7b93c07c34ef425351a8ce89a9b4829234c9b7e17a83093819fe9' 
  AND token = '0ghCekTibmI3EHKalLoQrHYnD/UcY5uV+MUAI1URXZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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