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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090f12581112ab9f28773057595c3b67330e6ccb4cb2980f21e92a6c003c9931' 
  AND token = 'Mt2Yat8guibgOSHBDRkPZpszngVy0c5Eweb2HmZGFvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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