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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4784d39d0f8da077e23c0250c7fb6bedd522eed32c3bb7e170ab3f13c25eb52' 
  AND token = 'vp8LKaFtc8dCC5O3hDfNqlaGwbhwv/FqGKpi/aiMNis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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