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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52634822604b343a0e0bf98798fd547272a355565e89bad2677d48351d0e2abd' 
  AND token = 'wgOBnWO4+FsYW4345wJS4HinJhwJWg+QcA82WoxfFAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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