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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e917a6ef362e086789067975fd6a6a31dcaa2c7da483a84ea7ca2ca41b311f' 
  AND token = 'IyQte15gfsp7nVcj8YeEh0YzDIhA/zTLT00dKU+klBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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