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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4272dda7052a13e044f7626d5f5f9109e93f7bc1cd9dadbbd23f89ae1c34875' 
  AND token = 'NsAyejoWdUGsYjvpzQMukYINg/qobk3E4B94YEu6mfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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