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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a0be133aa31373b2e6114f366a18b19ed352509ec0b9f823f5019abb56004c' 
  AND token = 'DlwLJYcdL6jAPTWhnSD6VzROBQHXKAEEV9AP4hY9E74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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