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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14bee11bda454a10cecc3820d72c1e0c20ec00c9f451a754a46801b24b055d12' 
  AND token = '5eXsY5UjTh6wbSpBlLNmpIDxV7UcJDXFWX4ozEkGfGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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