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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5221fb9b371c57876616d26a07b45e4207625ae90292c196daa0b48761c0c8' 
  AND token = 'PQYZGl5FyW9p+Puxa5ITMNamhpXIBmu9Q8mkSIk8sNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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