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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beeaaec755d7602d45b069cf87527503964bf2dad8c931ebf4d45eea367246ab' 
  AND token = 'jUlAzPI4rmth46Cbz/2bt457gKfJ8Qc4v4Q+GXJvFAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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