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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff31616cb52d1327cc2fba8101c050bc0875d2f494c4bfcffde96a0847398210' 
  AND token = '7rbWXnz/SyWO/0GxQtEybXOLaj5nsAvnoiAokGYkNgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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