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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3ae71c154e37576d3d6447c34287a1e57b729f6066077aa3ca1372a0f6ae48' 
  AND token = 'qiMZjLbDsVHAO2A2WWYbLymUHpFaIckMIOvqptdzRfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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