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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2a7e94d6b4302c758532efac0f04dbeeda7baf8b5941a9f8e391bb16c85e39' 
  AND token = 'Ifi7QEgruOwLuAc0texjFdmbThmrDPQmtWCEpcpTvOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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