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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84198c9fd2ea451155a7a157440b8f5a1c214ed555db7c83602f6fea53160b82' 
  AND token = 'TaME58SVf63JNK0xYnyg6KjydQ8jZIQSdekWgwPx6mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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