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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb77ec73d139f39f54dc96861c2b7527426bb7a32854a4e759f6f47db3505ae6' 
  AND token = 'Zzqio3CqM2Hfpo8BGrGXa1PohPqZwqHor22SB8HI1jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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