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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25c73cba303ef5039b79fed250d7eec5af4955fc04218b9557b7b1352cf8cdc' 
  AND token = 'kyzyFEl/mCfd6zLBj0o25tYqfCJthevK/wqBE3gw688=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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