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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89676dbbf89fbe53e452be9c900985b1f7d2b0d4d77c5c0501288687f942b26d' 
  AND token = '2Uv3T8d0VcFs4hXgr/WSxsPWaknoEw+4RVWsTagcxTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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