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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76c36c2d293534a5dc95e5afc446a2978280242ba13db41db4c721b48981205' 
  AND token = 'dYh1e1yTRvdici+VPrWCW7tOYgcuAcTk3/Hpld7o0dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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