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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3bed99bfad087b1b2f67c079508834d59f9280e122aa25f7c53be1dd70f71a' 
  AND token = 'FR/xOuHo5hll8w48Eug16ae2Jar6SSdx6Eeip7je7KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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