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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0194b146a0a8768ab49fc049cc69680a94dee0c73ab1b7079e602890b1a5c4e' 
  AND token = 'BdSrVNEw5c4Kqq6y6uM9eUE4nOyEsSHJhyTvToWkk4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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