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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f1a79670cea40d451d29eaaf88459881d5d938b5e97c7d759a58edbfa7ee43' 
  AND token = 'eHEd6oLptTf58lo3prhuRos8R994wLdIRv7HhwEIa5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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