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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3afb6ecf42b2e573ccfe23734ed5ca53da07a5ee2f720f2562292762e434a8f9' 
  AND token = 'OsJcP2l87aHxxEQ6fSUfTMh8D2rG6febmbyGJ69ZS30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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