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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8334bfb921c529f1687e8a29656e7e5c47abe656f87ae53782472fe141d24a59' 
  AND token = 'QinbqJsDnbqC1FSC+3CT9H7VCz0GegyLVJ5QbXH1ou8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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