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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8abe35ac8a0cf8504beab2eceea4f2610ad70c942d52c48b358caaab418aa3' 
  AND token = 'wfmd0tHa+87yMTfyumyuqX4JJ+1qJlx4IrLZpIFuDOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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