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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e783d6490a8ac6d9bbc9ce63b71d48f8b3e7232c284e952e69f5b5c35132b9' 
  AND token = 'sRvws1s5H5yMoKg2W4ytsrPVgD0jbMPLSZ8dtIxQNNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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