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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff37ea71f9edddd7ee1046e1b5898274ef108656f1c8ae2f8c6baca08752c70f' 
  AND token = 'atetdRIb/H6oj0Acjr/Q8QFgnC5hL+82gNjqS1ThUqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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