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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f71b7acf06d119bf0d8627488f5717683ca19c3730442099cdced0d3726eb70' 
  AND token = 'bS/EFiNDZ901I1QlpzteAa/LPJYDbCzfTEZKz34c6QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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