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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479872d114e18bfa66ce09c71da2c211a916f02fb696332e414c072ffc4c8779' 
  AND token = '0d+3oy/Zo182Ovq/0j9AS4EShKt2DYFJyvsDCPuaKcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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